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Prev Professional Automotive Repair Technical Discussions for October 12, 2011
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Open Help Requests for GM
Help Request Answers
1997 Buick Skylark Custom 2.4L instrument panel VIN: 1G4NJ52T3V
replaced ecm. checked all ground connections. checked replaced ignition switch. replaced instrument cluster.
2006 Buick Rendezvous CXL 3.5L lock up VIN: 3G5DA03L26
Vehicle surges because lock up i being commanded on and aff radiply at highway speeds. Have scoped checked all inputs that I can think of that would affect lock up. Aware of mass air flow sensor tsb and have scope checked sensor. I am out of ideas. We replaced...
1961 Chevrolet Corvette 4.6L turn signals
Need older corvette help. Have 61 vette in shop with turn signal problems. When signaling a turn, lever will not stay latched. Have to hold in position. Switch and cancel hardware have been replaced. Need to understand what is supposed to be on bottom of steer...
1996 Chevrolet C1500 Suburban 5.7L MIL Lamp on, No closed loop opera VIN: 3GNEC16R0T
Hello & thanks to all who wish to help. This is my first encounter with this truck AND this type of problem. Truck came in MIL on & codes p0134 & P0152. Scan pids showed B1S1 at 438mv and B2S1 at 642mv. Thru this whole thing never saw closed loop. ECT is 199 d... Trouble codes: P0134, P0152 (O2 sensor circuit high voltage B2S1)
2003 Chevrolet Express 2500 6.0L starter VIN: 1GCGG29U34
Well starter did not fix it. Reinstalled orginial starter.I have check wires from the relay to the computer yellow and black wire, 1.8 ohms. The wire from the ignition switch and from the fuse block to the relay I check at the same time that whole circuit has ...
2004 Chevrolet Silverado 2500 HD 6.6L No Start, white smoke VIN: 1GTHK23124
Morning All Tow in, crank no start .pump prime button , fires right up Truck runs great, no missing, power good BUT lots of white smoke at snap throttle Start Alldata tests for suction side of pump, Realized we need the gauge to hookup to test port .. Work aro... Trouble codes: P1093
2005 Chevrolet Silverado 3500 6.6L Red brk ligt VIN: 1GCHK39265
Am just wondering if anyone could give us any insight into what could be causing the red brake light to come on and stay on even when the key is out of the truck and the doors are closed we can not find any reasoning for this and neither can dealer...any help ...
1994 GMC Sonoma SL 4.3L wipers VIN: 1GTCS19W6R
turning on headlamps or hazard lamps causes the wipers to turn on. (park lamps does not) I have disconnected the multifunction switch- no change, bypassed the headlamp and headlamp dimmer switches-no change, cleaned rusted grounds at front core support/ radiat...
2007 GMC Yukon Denali 6.2L Air Bag VIN: 1GKFK63817
Vehical was in a wreck. All nessasary parts have been replaced. I am trying to program the diag sensing modual. We have the tech 2 and the tis web. It seems like the key code in the bcm is not matching the one in the dsm so i got another one. I still get th sa...
2000 Oldsmobile Intrigue GL 3.5L MIL Lamps VIN: 1GWX52H8YF
Codes found: P1571 TCS PWM Circuit No Frequency/Signal P1811 Maximum Adapt Long Shift CO550 ECU/CCU Malfunction CO241 PCM Indicated Request Torque Fault CO896 Device Voltage Range performance The one that concerns me most is the CO550 ECU/CCU Malfunction. Sin...
1986 Pontiac Firebird Trans Am 5.0L No Start VIN: 1G2FW87F4G
have no pulse when cold,will run with a shot of carb cleaner and will run fine after.replaced bad cts and tps,car ran fine for a month.car is back,and coolant temp sens is stuck again,replaced it and reads fine but same problem,no start when cold.unplug tps an... Trouble codes: 22 (tps too low), 21 (tps too high), 15 (coolant temp too high), 34 (maf too low), 44 (lean exhaust)
2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R5Y
customer brought vehicle in to get check engine light fixed. pulled code #P0401 for EGR system. has .74v at all time and duty cycle is 0. checked all wiring. all powers and grounds are good. has no other running issues and idles fine. Trouble codes: P0401 (EGR- Insuffiecient flow detected)

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Terraza CXL 3.5L cruise control VIN: 5GADV23L75
To everyone who helped me THANK YOU. I am sorry to report but this vehicle left without being fixed BUT I did learn alot about this system. After going back over this system with a fresh mind I determined that the back feed into the light green circuit was not...
1991 Chevrolet Corvette 5.7L Hesitation, Surge, Cuts out VIN: 1G1YY2383M
OK. First of all I want to apologize for taking so long to close this request. I have been waiting on the customer to return so I could continue testing. But no luck as of yet. :/ But I do want to thank ALL of you that responded. Many helpful tips were given. ...
1999 Chevrolet Silverado 1500 4.8L Abs Module VIN: 1GCEK19V4X
thank you to everyone that took time out of their day to help me out. sorry the fix is being posted so late. first of all the new modules were dealer parts. after the first one failed i even got to speak with the top tech in the dealership who agreed that the ...
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W81
Thanks to everyone who replied, and I'm sorry it took so long to get the car back in. Most of you suggested to replace both of the check valves and I did. Time will tell, and I hope everything will be ok. Once again thank you to everyone who replied Trouble codes: P0410 (Secondary air injection system fault).
2004 Chevrolet Silverado 1500 4.8L Hesitation, Surge VIN: CGCEC19V04
2006 Chevrolet Trailblazer LT 4.2L 226 T case VIN: 1GNDT13S56
Well, we did finally fix this thing. It required an actuator assembly, electrical and mechanical with cv axle. G101 ground cleaning brought back electrical functions. Reflashed TCCM, replaced encoder motor again, switch on dash fucntions well. The fix was ...
2003 Pontiac Vibe GT 1.8L No Start, Hesitation, Cuts out, Stall VIN: 5Y2SN64L83
after getting more information from the customer i found that there was bad gas put into the car and the code that i pulled had nothing to do with it. thanks for all the help. Trouble codes: P1693 (Rocker arm actuator stuck off).
2003 Saturn Vue 3.0L Cuts out, Stall VIN: 5GZCZ63B13
Thanks for all the help and with the help of an employee joining a saturn forum we traced it to the ecm. we replaced the ecm and have not heard from the customer in 3 weeks. thanks again. Trouble codes: P1629.
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